Calculate number of days between two dates in r

Question

I need to calculate the number of days elapsed between multiple dates in two ways and then output those results to new columns: i) number of days that has elapsed as compare

Answer 1

For the first part:

DATA = data.frame((c("7/8/2013",  "8/1/2013", "8/30/2013", "10/23/2013","12/16/2013", "12/16/2015")))
names(DATA)[1] = "V1"
date = as.Date(DATA$V1, format="%m/%d/%Y")
print(date-date[1])

Result:

[1]   0  24  53 107 161 891

For second part - simply use a for loop